7.The table below gives some information about elements represented by letters B, C, Dand E. Study the information and answer the questions that follow:Element Atomic radii (nm) Melting Point 0 CB 0.152 180C 0.186 98D 0.231 64F 0.244 39(i) Would these elements form part of group orperiod?Explain. (2 marks)............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................10(ii) What does the trend in melting points suggest about the nature of theelements(1 mark)..............................................................................................................................................................................................................................................................................
Question
7.The table below gives some information about elements represented by letters B, C, Dand E. Study the information and answer the questions that follow:Element Atomic radii (nm) Melting Point 0 CB 0.152 180C 0.186 98D 0.231 64F 0.244 39(i) Would these elements form part of group orperiod?Explain. (2 marks)............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................10(ii) What does the trend in melting points suggest about the nature of theelements(1 mark)..............................................................................................................................................................................................................................................................................
Solution
(i) These elements would form part of a group rather than a period. This is because the atomic radii of the elements are increasing, which is a characteristic trend of a group in the periodic table. In a period, the atomic radii generally decrease from left to right due to an increase in the positive charge of the nucleus, which pulls the electrons closer.
(ii) The trend in melting points, which is decreasing, suggests that the elements become less metallic in nature. This is because metals generally have high melting points due to the strong metallic bonds that need to be broken for the substance to melt. As the melting point decreases, it suggests that the metallic character of the elements is decreasing.
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